msgportdemux.c

/* Demux messages sent on the signal port. Copyright (C) 1991,92,94,95,97,99 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */#include <hurd.h>#include <hurd/signal.h>#include <stddef.h>struct demux
{
struct demux *next;
boolean_t (*demux) (mach_msg_header_t *inp,
mach_msg_header_t *outp);
};
struct demux *_hurd_msgport_demuxers = NULL;
extern boolean_t __msg_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
static boolean_t
msgport_server (mach_msg_header_t *inp,
mach_msg_header_t *outp)
{
extern boolean_t _S_msg_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
extern boolean_t _S_exc_server (mach_msg_header_t *inp,
mach_msg_header_t *outp);
struct demux *d;
for (d = _hurd_msgport_demuxers; d != NULL; d = d->next)
if ((*d->demux) (inp, outp))
return 1;
return (_S_exc_server (inp, outp) ||
_S_msg_server (inp, outp));
}
/* This is the code that the signal thread runs. */void
_hurd_msgport_receive (void)
{
/* Get our own sigstate cached so we never again have to take a lock to fetch it. There is much code in hurdsig.c that operates with some sigstate lock held, which will deadlock with _hurd_thread_sigstate. Furthermore, in the cthreads case this is the convenient spot to initialize _hurd_msgport_thread (see hurdsig.c:_hurdsig_init). */
_hurd_msgport_thread = _hurd_self_sigstate ()->thread;
while (1)
(void) __mach_msg_server (msgport_server, __vm_page_size, _hurd_msgport);
}